1. I. B. Grudnikov, Khim. Tekhnol. Topl. Masel, No. 12, 16?18 (1976).
2. V. S. Andreev, V. I. Varavin, V. S. Evseev, et al., NefTepererab. Neftekhim., No. 12, 18?22 (2002).
3. V. V. Fryazinov, R. S. Akhmetova, I. A. Chernobrivenko, et al., Ibid., No. 7, 2?7 (1977)l.
4. S. A. Kotov, D. S. Starov, V. A. Morozov, et al., Avtomobil. Dorogi, No. 9, 60?61 (2003).